> I used HTTrack to save a backup of the website for one of 
> my college classes.  The class is regarding a statistical 
> program called SAS, and the webpage had many examples of 
> SAS code writtin in plain text in the HTML files.
> Upon saving the webpage, I recieved numerious errors like 
> the following example:

The html code is actually malformed:
<pre>
..
  IF meanp <= 8.5 THEN OUTPUT;

The "<=" seems to start a tag. Browsers like IE or Mozilla 
are very tolerent, and "recognize" that this is not a tag.

httrack is stricter, and detects the "fake" DATA property 
in this text segment

The problem is not very easy to solve - I'll try to figure 
out a way.

But the best solution would be to escape the embedded 
text ; using &lt; and &gt; for the characters tags